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IBC SFC 125 Outdoor Reset

OG_Simon
OG_Simon Member Posts: 12
in THE MAIN WALL
I recetly fired my new SFC 125 combiboiler. 8 runtal radiators on the main floor on 2 zones, 4 runtals in the basement on one zone. I have connected the outdoor reset feature and it is running very well however I would like to move the curve up by a few degrees. For example, increase the boiler supply temperature by a couple degrees for each degree of outdoor temperature drop.

Currently it appears the supply temp is a bit low and the room temperature doesn’t reach the 70 F set point, as a result the boiler runs constantly. I’ve searched extensively but the parameters in the boiler menus don’t really give a lot of flexibility. The settings I have available are, degrees C/100 seconds or a min/max supply temp. When ODR is disconnected I set the supply temperature at 170 and it cycles about 3-4 times per hour (old drafty, 1920’s uninsulated house). I thought i’d have the ability to build my own simple ODR curve customized to the heat loss characteristics of the house.

Are there any IBC installers out there that can give me some guidance on this issue? Much appreciated.

Comments

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,214
    edited February 12
    On page 1-13 of the controller manual - click below link - you can access and change the installer values, particularly parameters P050 thru P053.
    chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.ibcboiler.com/support/TIPortal/Content/Guides_and_manuals/SF_series/SFC_SFB_ContManual_EN.pdf
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Teemok
    Teemok Member, Email Confirmation Posts: 677
    edited February 12
    Make sure your od sensor is where it is not warmed by exhaust or the sun or a warm high mass near it.(masonry walls)

    Like Alan said above p050-p053 are where you can change things. Particularly p052, the higher you set the design odt and the minimum swt the more you shift upwards on the curve or slope. The higher the supply max the more aggressive the overall heating is. Going aggressive and backing off is a more comfortable game.

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,378
    edited February 12
    ADJUSTING THE SPACE HEATING
    WATER TEMPERATURE
    To adjust the water temperature in the space heating:
    1. From the Main menu, touch the Space Heating
    button.
    The current target temperature is displayed on the left side. Note that the Faucet
    and Wrench are no longer displayed.
    2. To change the target temperature or space heating, tap the Plus or Minus
    buttons.
    3. To save the changes, touch the Return
    button

    If that does not help then there is an advanced parameter menu

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    kcopp

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